Air compressor maintenance device



FIG. 1 is a perspective view of an air compressor maintenance device, showing our new design;

FIG. 2 is a top plan view of our new design;

FIG. 3 is a side elevation view of our new design;

FIG. 4 is a side elevation view of our new design;

FIG. 5 is a front elevation view of our new design;

FIG. 6 is a rear elevation view of our new design; and,

FIG. 7 is a bottom plan view of our new design. 

The ornamental design for an air compressor maintenance device, as shown and described. 